| A | B |
|---|
| atom | the smallest part of an element |
| element | contains only one type of atom |
| mixture | contains two or more elements or compounds not mixed together |
| filtration | separates an insoluble solid from a solution |
| crystallisation | separates the soluble solid from a solvent by evaporation |
| simple distillation | separates a solvent from a mixture |
| chromotography | separates mixtures dissolved in a solvent |
| plum pudding model | ball of positive charge with electrons embedded in it; no overall charge |
| fractional distillation | separates mixtures of miscible liquids |
| electron shells | electrons orbit the nucleus at specific distances |
| proton | sub atomic particle with positive charge and relative mass of 1 |
| neutron | sub atomic particle with no charge and relative mass of 1 |
| electron | sub atomic particle with negative charge and relative mass of 1/2000 |
| nucleus | middle of atom; contains protons and neutrons |
| atomic number | number of protons in an atom |
| mass number | sum of protons and neutrons in an atom |
| isotopes | atoms of the same element eg copper, with different numbers of neutrons |
| relative atomic mass | an average value that takes into account the abundance of isotopes |
| compound | contains 2 or more elements combined in fixed proportions |
| nuclear model | mass of the atom concentrated in the centre (the nucleus) and that the nucleus was charged |
